1. The number of cars produced in Australia showed an upward trend
2. Germany witnessed an increase in the amount of money spent on books, reaching a peak of 500 million dollars
If you add full stops, these sentences will be mostly OK. However, the structure of sentence (2) is slightly faulty as it implies that Germany reached a peak of 500 million, whereas you mean that money spent on books reached a peak of 500 million.
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If you add full stops, these sentences will be mostly OK. However, the structure of sentence (2) is slightly faulty as it implies that Germany reached a peak of 500 million, whereas you mean that money spent on books reached a peak of 500 million.